You're ahead of me mine isn't working at all! It's the next project once I (imminently) get the GSXR back together. My 2 stroke knowledge is extremely limited but, if it's running like a bag of nails, do you have the baffle (+wadding) when mine was running (badly) I'm sure it was the lack of baffle making it erratic (based on having set everything else as per spec and rebuilt the top end).